Line Pipes are manufactured as per specifications established by american petroleum institute (api). API 5l is a specification of api which defines the standard for the dimension, physical, mechanical and chemical properties of the steel. we at Reliable Pipes & Tubes known as 3rd largest supplier & distributor of Seamless Steel Pipe, Welded ( ERW, LSAW, SSAW ) Steel Pipe made of Carbon steel and alloy steel according to API, ASTM, ASME, DIN standards strictly.